Middle frequency operating device



FIG. 1 is a perspective view illustrating a middle frequency operating device;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 a bottom view thereof. 

CLAIM We claim the ornamental design for a middle frequency operating device, as shown and described. 